<template>
  <li>
    <label>
      <input type="checkbox" :checked="todo.isDone" @change="handleDone(todo.id)"/>
      <span v-show="!todo.isEdit">{{todo.title}}</span>
      <input type="text" :value="todo.title" v-show="todo.isEdit" @blur="handleBlur(todo,$event)" ref="inputTitle">
    </label>
    <button class="btn btn-danger" @click="deleteChcek(todo.id)">删除</button>
    <button class="btn btn-edit" @click="handleEdit(todo)" v-show="!todo.isEdit">编辑</button>
  </li>
</template>
<script>
export default {
  name: "MyItem",
  props:["todo"],
  methods: {
      //双向绑定isDone
      handleDone(id){
          this.$bus.$emit("checkDone",id)
      },
      //删除todo
      deleteChcek(id){
          if (confirm("确定要删除吗？")) {
              this.$bus.$emit("deleteTodo",id)
          }
      },
      //编辑todo
      handleEdit(todo){
        if (todo.hasOwnProperty.call("isEdit")) {
          todo.isEdit = true
        } else {
          this.$set(todo,"isEdit",true)
        }
        this.$nextTick(() => {
          this.$refs.inputTitle.focus()
        })
      },
      //失去编辑框焦点后更新数据
      handleBlur(todo,e){
        todo.isEdit = false
        if (!e.target.value.trim()) return alert("不能为空")
        this.$bus.$emit("updateTitle",todo.id,e.target.value)
      }
  },
};
</script>
<style scoped>
/*item*/
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1px solid #ddd;
}

li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}

li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}
li:hover {
    background-color: #ddd;
}
li:hover button {
    display:block;
}
</style>